I Googled a bit and found someone already merged this for showing updates size but i can’t see it under Fedora 36 Gnome Software
As far as I know Gnome software doesn’t show this info yet, I am not sure why but you can use dnf to see the download size and then use Gnome software to update if you want to. I know its unnecessary hassle that you have to do but right now that’s the only option available on Gnome.
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